@article{Terras1976,
  author    = {{Riho Terras}},
  title     = {{A stopping time problem on the positive integers}},
  journal   = {{Acta Arithmetica}},
  year      = {{1976}},
  volume    = {{30}},
  pages     = {{241--252}},
  url       = {{https://eudml.org/doc/205476}},
  note      = {{MR 58 #27879}},
}